@atsimcomati

it seems I cannot edit , so here's an update

it's my provider, using another SIM I can send all the SMS's I want.

hello

here:
LilyGO github page
has an example for sending SMS.

However, me for one I have a problem with it, I can only send one SMS, all other subsequent SMS's fail.

If I send them one after another, happens that I can send two of them.

I don't know if the boards (2) are defective or in the SendSMS example is there something missing?

the board I defined is
#define LILYGO_T_A7670
(I bought the E version too)

Compilation, upload, ali go without any error